Best practice for Unit Testing

I'm trying to follow the "Best practice for unit testing" page on the WAB (Dev Edition) Guide. It starts by saying - use npm to install intern. This is where I'm stumped, as it seems to expect you have a non-windows install of WAB. Let me explain....

I'm using WAB (Dev Edition) on a windows PC, so node is already packaged as part of the install, but there is no npm.cmd file anywhere in the file structure. I tried installing the standard nodeJS (which does have npm.cmd), but that has it's own node_modules folder and anything installed usiing npm will be installed there and not under the WAB's node_modules folder.

Is there anyone out there who's using a windows install of WAB and has already gone through the pain of getting this working, that could give me som guidance please.